考虑徐(温)变的连续梁拱桥车桥耦合振动分析

根据弹性系统动力学总势能不变值原理及形成矩阵的"对号入座"法则,考虑了连续梁钢管混凝土拱桥桥面因温度和徐变作用而产生的变形影响,将其以组合曲线的形式叠加到轨道不平顺中进行列车走行性分析,建立车桥系统振动方程。采用计算机模拟的方法,建立列车和桥梁动力分析的有限元模型,研究了桥面徐变变形及温度变形对车桥系统耦合振动的影响。结果表明:桥面的徐变及温度变形所致的线路不平顺对轮重减载率、车体竖向加速度和竖向Sperling指标的影响较为显著。因此,在评判桥上列车的运行安全和舒适性时,尤其对于高速铁路,应考虑混凝土徐变及温变产生的桥面变形引起的轨道不平顺影响。

Vehicle-Bridge Coupling Vibration of Continuous Beam Arch Bridge Considering Concrete Creep and Temperature Deformation of Bridge Deck

According to the principle of total potential energy with stationary value in elastic system dynamics and the "setting in right position" rule for formulating system matrixes,the coupling vibration equation of vehicle-bridge system is established,considering the deformation of the continuous beam concrete-filled steel tube arch bridge deck generated by the creep and temperature,and making the deformation overlaps the track irregularities in the form of combinational curves.The computer simulation is adopted to establish the dynamic FEM model of vehicle-bridge system and the effect of deck creep and temperature deformation on coupling vibration of vehicle-bridge system is researched.The results show that track irregularities caused by the deck creep and temperature deformation influence the load decrement rate of wheel weight,the vertical acceleration and the vertical Sperling index so obviously that track irregularities need to be considered,when the safety and driving comfort of vehicle on the bridge is evaluated,especially for the high-speed trains.